20516402 has 8 divisors (see below), whose sum is σ = 30794796. Its totient is φ = 10251472.

The previous prime is 20516387. The next prime is 20516417. The reversal of 20516402 is 20461502.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20516387) and next prime (20516417).

It can be written as a sum of positive squares in 2 ways, for example, as 20349121 + 167281 = 4511^2 + 409^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2468 + ... + 6864.

Almost surely, 2^20516402 is an apocalyptic number.

20516402 is a deficient number, since it is larger than the sum of its proper divisors (10278394).

20516402 is a wasteful number, since it uses less digits than its factorization.

20516402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6732.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 20516402 is about 4529.5035048005. The cubic root of 20516402 is about 273.7581558978.

Adding to 20516402 its reverse (20461502), we get a palindrome (40977904).

The spelling of 20516402 in words is "twenty million, five hundred sixteen thousand, four hundred two".